On 23/01/13 08:43, Ian Sergeant wrote: > It raises the age old question, if we can't edit it, why put it in OSM? > If each set of data is intended to overwrite the last, what do we do > when people change it?
Oh, I thought OSM was aiming for an objectively correct map via user contributions, is there actually anyone arguing for some kind of libertarian approach to ground truth? ;) There's no reason why using feeds such as the TDX is incompatible with individual user editing. From first-hand experience, even the PT agencies get their data wrong at times, and so the legion-with-smartphones out there is still actually quite important. The usefulness of these feeds is two-fold, the first is obviously for populating a large amount mostly-correct data otherwise missing from OSM, but equally important is getting updates down the track. Bad data is after all just as bad as missing data (worse?), as my local government GIS friend constantly complains. The challenge then is how to merge feed updates along with individual-generated changes. It's not impossible, it just requires the right data, some conventions, some code and a bot. > It would be nice to see the data integrated with OSM as another "layer", > however from what Andrew was saying it is only a point to point graph, > so we can't get OSM style public transport routes from it, only stops. I don't have any experience with TransXchange or OSM style public transport, but GTFS does indeed include service routes and timetable data in addition to stops. The data is there, it just needs a decent licence. //Mike -- ⊨ Michael Gratton, Percept Wrangler. ⚙ <http://mjog.vee.net/>
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